Symptoms guide

Dizziness

Dizziness is a general term for feeling lightheaded, faint, unsteady, or as if the surroundings are spinning. It is very common and usually not caused by a serious condition, but it sometimes signals a problem that needs prompt care.

Last updated 3 sources

At a Glance

  • Dizziness is often grouped into lightheadedness, vertigo (a spinning sensation), and imbalance.
  • Inner ear problems are a common cause of vertigo.
  • Lightheadedness is often related to blood pressure drops, dehydration, or low blood sugar.
  • Sudden dizziness with weakness, numbness, facial drooping, trouble speaking, or vision changes may signal a stroke and is generally treated as a medical emergency; in the US, people are advised to call 911.
  • Dizziness raises the risk of falls, especially in older adults.

What It Is

People use the word dizzy to describe several different feelings. Lightheadedness is a feeling of being about to faint. Vertigo is the false sense that the person or the room is spinning or moving. Disequilibrium is a feeling of unsteadiness or being off balance.

Balance depends on the inner ear, the eyes, sensory nerves in the body, and the brain working together. A problem with any of these, or with blood flow to the brain, can lead to dizziness.

Clinicians often start by asking exactly what the dizziness feels like, how long it lasts, and what brings it on, because these details help guide evaluation.

Common Terminology

Vertigo
A false sense of spinning or movement of oneself or the surroundings.
Presyncope
The feeling of being about to faint, often described as lightheadedness.
Syncope
A brief loss of consciousness, commonly called fainting.
BPPV
Benign paroxysmal positional vertigo, brief spinning episodes triggered by head position changes due to displaced crystals in the inner ear.
Orthostatic hypotension
A drop in blood pressure when standing up that can cause lightheadedness.
Vestibular system
The parts of the inner ear and brain that help control balance and eye movements.
Nystagmus
Involuntary, repetitive eye movements that clinicians may look for when evaluating vertigo.

Common Causes and Associations

Dizziness is commonly associated with the following. This is general education, not a way to identify the cause in any particular case.

  • Inner ear conditions such as BPPV, vestibular neuritis, labyrinthitis, and Ménière's disease.
  • Drops in blood pressure, including when standing up quickly, and dehydration.
  • Side effects of medicines, including some blood pressure medicines, sedatives, and antidepressants.
  • Low blood sugar, anemia, and heart rhythm problems.
  • Migraine, anxiety, and panic attacks.
  • Less commonly, stroke or other conditions affecting the brain.

Symptoms and Features

This is a general description of how this symptom is often described, not a diagnostic checklist.

  • A spinning or tilting sensation, often worse with head movement, in vertigo.
  • A faint, woozy, or about-to-pass-out feeling in lightheadedness.
  • Unsteadiness, swaying, or trouble walking in a straight line.
  • Nausea or vomiting, especially with vertigo.
  • With some inner ear conditions, ringing in the ear, a feeling of fullness, or changes in hearing.

Tests and Evaluation

Evaluation usually begins with a detailed description of the dizziness and a physical exam.

  • Blood pressure and heart rate measurements, sometimes lying down and standing.
  • A neurological exam and eye movement checks.
  • Positional tests, such as the Dix-Hallpike maneuver, used to look for BPPV.
  • Hearing and balance tests in some cases.
  • Blood tests, an ECG, or imaging such as MRI when certain causes are being considered.

Treatment Overview

Treatment depends on the cause identified by a healthcare professional.

  • BPPV is often treated with repositioning maneuvers, such as the Epley maneuver, performed or taught by a clinician.
  • Vestibular rehabilitation therapy uses exercises to help the brain adapt to inner ear problems.
  • Drinking enough fluids and rising slowly are commonly suggested for lightheadedness related to standing up.
  • Medicines may be used for some causes, such as short-term relief of vertigo or nausea, or to treat migraine.
  • When a medicine is suspected as the cause, a clinician may review the person's medication list.

When Professional Care May Be Discussed

Health organizations generally describe these situations as reasons for urgent or prompt evaluation.

  • Sudden dizziness with weakness, numbness, facial drooping, slurred speech, double vision, or severe headache is generally treated as a medical emergency; in the US, people are advised to call 911.
  • Dizziness with chest pain, shortness of breath, a racing or irregular heartbeat, or fainting is generally treated as an emergency.
  • Dizziness after a head injury is commonly evaluated promptly.
  • Sudden hearing loss with dizziness is commonly evaluated promptly.
  • Repeated, unexplained, or long-lasting dizziness, or dizziness that leads to falls, is commonly discussed with a healthcare professional.

Questions to Ask a Healthcare Professional

General questions people often find useful to bring to an appointment:

  • What is the difference between vertigo and lightheadedness?
  • What is BPPV and how is it generally treated?
  • Can medicines contribute to dizziness?
  • What tests are commonly used to evaluate dizziness?
  • Which dizziness warning signs may point to a stroke?
  • What is vestibular rehabilitation?

Sources

This guide was written in plain language from the following authoritative references.

  1. Dizziness and Vertigo — MedlinePlus (U.S. National Library of Medicine)
  2. Dizziness — NHS (UK National Health Service)
  3. Vertigo — NHS (UK National Health Service)

Last updated October 8, 2026. FreeDoc guides are general educational information and are not a substitute for care from a qualified professional.